Process of obtaining acidylic derivatives of esters of dimethylamino-dimethyloxyacetic acid.



pmrno srxrns Parana opt on.

' ERNEST roURNEAU, or PARIS, FRANCE.

rnocnss or OBTAINING ACIDYLIC DERIVATIVES OFESTERS or DIMETHYLAMINO- DIMETHYLOXYACETIC ACID.

No Drawing.

To all whom it may concern:

Be it known that I, ERNEST FoURNEAU, a citizen of the French. Republic, residing in Paris, in the Republic of France, have invent-ed certain new and useful Improvements in Processes for Obtaining Acidylic Derivatives of Esters of Dimethylaminodimethyloxyacetic Acid, for which application has been made in France, February l, 1906; Germany August 15, 1906.

The process is for obtaining acidylic derivatives of esters of dimethylaminodimethyloxyacetic acid. They are of the form cn -o-oa C OaR in which R is an acidyl group and R is an alkyl group. The esters from which these derivatives are obtained, and which have the above formula with H substituted for R, are described in the applicants co-pending case Serial No. 3543M, filed January 28th, 1907. These esters can'all be as easily acidylized as the amino-alcohols of the U. S. Patent 828,846 and by the same methods. These acidylized derivatives are susceptible of variable industrial employment in therapeutics, as they possess the same general properties as the amino-alcohol esters described in U. S. Patent N 0. 829374: and these properties vary according to the acid which is used for the reaction. The benzoic ester of the body en y-on for example, possesses powerful anesthetic properties and a feeble toxicity. v

In a general manner the salts are prepared best by mixing molecular Weights of the amino-alcohol andof the chlorid of an acid dissolved respectively anhydric benzene. The mixture, at first clear, is heated strongly for some minutes, when the chlorhydrate of the acidylic derivative precipitates, nearly always crystallized and pure.

Other general methods can be employed. For examplevBoil .the amino-alcohol with the benzoic or aceticanhydrid, or with any other anhydrid of an acid in the presence of benzene, agitate the base With a chlorid of acid and bicarbonate of soda or pyridin. It is important solely to avoid the action of.

Specification of Letters Patent.

Application fi1ed January28, 1907. Serial No.

i-atented Mar. 115, 1910}. 354,468.

strong alkalies which can. saponify the ester group. 3

First example: Dimcthylaminodimethyle benzoyloxyacetatn of ethyl, i

OII2.N(CH3)3 -CH3CO-(CO.C6H5) Mix cold the two solutions constituted as follows cohol cnsmoinp cH.-con I COz.C H

dissolved in 200 grams of benzene.

Second solution, lOOgrams of chlorid of benzoic acid dissolved in 200 grams of henzene.

A considerable rise of temperature ensues. The liquor is at first limpid, then during the next few hours it forms itself into a mass of crystals. Dry by centrifuging, wash several times with anhydrous other andfinally crystallize out in amixture of alcohol and ether. The yield amounts to 95%. The product has the form of very fine needles, melting at 137 degrees centigrade, very soluble in alcohol and aceton. The substance possesses pronounced anesthetic properties. The free base or amino-ester of benzoic aci, is liquid, syrupy and insoluble in water, an boils at 210 C. under 42 millimeters pressure and is ob tained by treating the hydrochlorid-of the ester with alkaline carbonate.

Second example: Dimethylaminodimethyl benzoyloxyacetate of methyl oHimcHm ornoco.o,H.)

COzCHg. Boil the following mixture for about 5 hours in an apparatus provided with a re-.

ably 1 part fuming hydrochloric acid to 5 parts water). Any other inorganicacid of First solution, 100 grams of the amino also I,

ios

suitable concentration may be used for this purpose. All the benzolic base or aminoester of benzoic acid passes into the acid solution. This last is evaporated in cacao to a syrupy consistency. The residue is treated with dry carbonate of soda which sets the amino-ester of benzoic acid at liberty aswvell as the unaltered amino-alcohol which has not entered into the re-action. The mixture of the bases is extracted With ether. The ether solution is washed several times with water, to take out the small quantity of non-benzolized amino alcohol, then it is dried over dry sulfate of soda. The ether solution is then treated with a concentrated alcoholic solution of gaseous hydrochloric acid, the chlorhydrate of the benzolie deriv ative being precipitated. The latter is washed with ether, centrifuged, and recrystallized in a mixture of absolute alcohol and of ether. It crystallizes in line needles; its properties are identical with those of the ethyl derivative of Example No. 1. It melts at 149 to 150 degrees centigrade. The free base or ammo-ester of benzoic acld 1s llquid, syrupy, insoluble in water, and bolls at 220 C. under 75 milllmeters pressure and is 'obtamed by treatlng the chlorhydrate With alkahne carbonate.

Third example: Dlmethylaminodimethyl 1sovaleryloxyacetate of .ethyl onaNwnm Mix 200 grams of the amino-alcohol as in Example 1, 500 grainy of anhydrous benzene, 160 grams of el lorid of isovaleryl CJ-L COCI. Notable heating ensues. After several hours the chlorhydrate of the isovaleryl derivative is precipitated in the state of pretty spangles. Yield 220 grams. After recrystallization in a mixture of aceton and ether the substance has the form of needles grouped in spangles, melting at 182 degrees. The chlorhydrate is hygroscopic. The free base or amino-ester of isovaleric acid is liquid and boils at 138 C. under 17 millimeters pressure.

Fourth example: Dimethylaminodimebromoisovaleryloxyacetate of ethyl onamonoz CH -CO- CO.CIIg.CBr(CH;) v doacms.

Mix 200 grams of base as in Example 1, 800 grams of benzene, 250 grams of chlorid of bromoisovaleryl C,I-I BrCOCl. The

re-action is very lively, but it does not separate out the chlorhydrate of bromoisovaleryl brought to boiling point nor distilled Wltl1' out decomposing.

The acidylic derivatives produced by theprocess which forms the subject of the present invention are used in various ways in medical science; they possess anesthetic properties, and can be "largely used for producing local anesthesia, one of their principal advantages for this purpose being that they are only very slightly poisonous as compared With such anesthetic substances as cocaine, which have'been most usually employed for this purpose up to the present time. I

I declare that What I claim is A process for obtaining the acidylic derivatives of the esters of dimethylaminodimethyloxyacetic acid, of-the formula enamels .on-i-ceon (iOaR in which R: an acidyl group R an alkyl consisting in mixing in the cold molecular weights'of the esters of the a ino-oxy-acids of the general formula l cmmcnm oiac on and a substance capable of replacing the Witnesses.

"ERNEST FOURNEAU. Witnesses:

'ANTONIN- MONTEILHET,

HANSON G. Coxn. 

